digital data transmission and reception

Hi -

(XP embedded PC)
I am trying to monitor and set various digital inputs and outputs within an electromechanical machine.

I am at present, using 8 port digital input output boards connected together via an RS485 link.
I have around 60 outputs and 30 inputs which I wish to set and monitor within a short space of time. (around 5mS)
My problem is that the serial data transmission and consequent reception from each board takes far too long. I know I could attach a GPIO device to my PC (XP embedded) and instantly send and receive, but I wish to use some sort of shift register system (similar to boundary scan devices).
Is there any such animal commmercially available?
Chris
chrislockAsked:
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btanExec ConsultantCommented:
You want to consider serial to Ethernet (for speed) and Multiplexer (for time division) for analysis.
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chrislockAuthor Commented:
Thanks for the thought, but I was thinking of some sort of very simple and inexpensive system - the complications of ethernet and mux systems are a definite overkill for a relatively small amount of digital I/o over a small distance.
Chris
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btanExec ConsultantCommented:
maybe this open project can help.
it has the s/w & h/w schematics. also using shift register.

http://users.skynet.be/DCI_Site/dcibus_e.html
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